Therapeutic percussor



Feb. 28, 192s., 1,660,821 I w. H. SWE'ETLAND THERAPEUTIC PERCUSSOR FiledAug. 4, 1924 L? WML/,4M hf SWE/572 AND ,r @5% aun/kvm# Patented Feb. 28,1928.

UNITED stares temen vrm"@Enr1- aries;

WILLIAM I-I. SWEETLLAND, OF SAN DIEGO, CALIFORNIA.

THERAPEUTIC IIEliJJEtCl'SSOR.

. Application filed August 4, 1924. Serial Non.` 730,083.

My invention relates to a therapeutic percussor for preparing patientsprior `to making chiropractic adj ust-ments, and in general forstimulating the flow of blood and for stimulating the action andvdevelopment of muscle and tissue, and the objects of my invention are:first, to'provide a compact and eiiicient machine of this class which isparticularly adaptable for the follow-up.

therapeutic work in connection with frac-- tures, vbruises and the likefor stimulating .blood circulation and the action and devel? opment ofmuscle and tissue; second, to provide a machine of this class which issubstantially noiseless in its operation; third, to provide a machine ofthis class which has relatively few moving and wearing parts and inwhich the wearing parts may be easily removed when worn and replaced byA others; fourth, to provide va novelly. constructed connecting rod andplunger means whereby the positive blow is directed directly seventh, toprovide a n-ovel means for secur- .ing the supporting handle to thecasing;

eighth, to provide a machine of thisy class of such weight that the samemay rest with its whole weight on the body or members of theA patient toobtain the desired results,l andV which ris merely guidedv over the bodyor members of the patient by the operator; ninth, to provide as a wholea novelly constructed therapeutic percussor, and tenth, to

provide a machine of this class which is particularly simple andeconomical of construction, durable, and which will not readilydeteriorate or get out of order. v

With these and other objects in view, as

will appearhereinafter, my invention consists of certain novelfeaturesof construction, combination and arrangement of parts and portions, as.will vbe hereinaftery described in detail and particularly set forth inthe appended claims, reference being had to the Aaccompanying drawingsand to the characters of reference thereon, which form a part of thisapplication, in which: Y`

Figure 1 is a sectional elevational'view of my therapeutic percussor,with the section takenthrough 1-1 of Fig.'2, certain parts and portionsbeing shown in elevation to facilitate the illustration; Fig. 2 is afront elevational View thereof, with the cover of the casing partlybroken away; Fig." :is a fragmentary sectional elevational View thereof,withrthe section takenthrough 3-3 of Fig. 1, 'and Fig. 4 is anothersectional view thereof' in plan, witlithe section taken at y 4 4 of Fig.1`.

Like characters of reference refer to similar parts and portionsthroughout. the several views of the drawings. i i

The casing 1, cover 2, screws 3, mot-or 4 `motor shaft 5dr1ve pinionscrew 7, gear 8, gear supporting stud 9,' gear positionin@r member 10,stud 11, roller 12, connecting ro bearing membery 13, V'connecting rod14, plunger 15, pin 16, bushing 17, stuffing bon cap 1S, body contactmember 19,'e-lectric cablel 20handle member 21, screws 22, and f thegreasey plugs 23,` constitute the principal parts and portions of myrtherapeutic percussor. f

` rThe casing 1 of mymachine is provided at its front side with a hollowportion la` in which is positioned the operating mechanism ofthemachine.` At thefront side of the casing and over the hollowportionthereof is secured a cover 2 `by means of screws 3, which cover isadapted to retain the operating mechanism in position.y rlhe casing isprovided at the lower portion of its back side with a hackwardlyextending', cylin! e a u b n drical portion l1, which serves as. apartial outer portionof which the housing of the motor 4i is secured,`preferably by means'of bolts 4a extending through the front of thecasing. The-shaft 5 of the motor is revolubly mounted in andeXtendstl'irough a bushing 1c mounted in tliewall of and in the lower portionof the casing 1. At 'the end housing forthe motor 4, and against the ofthe shaft'oexte'nding into the hollow portion laof the casingis secureda drive pinion 6 by means of a shaft-expanding screw 7.

Meshing'withthe'pinion 6 is a large drive gear 8, which is secured atthe one end of a stud 9, preferably bybeing driven thereon, which studis revolubly mounted at its vopposite enlarged end iii a. bushing 1dmounted in the wall ofthe casing 1. The gear 8 is preferably heldinengagementv with a boss i. within the hollow portion of the casing bymeans of a gear positioning member 10, preferably made ofliiber, which1s secured at the end of a lug 2av secured to and extending inwardlyfrom the cover2, as shown best .in Fig. 1. At the side of the gear 8opposite the stud 9 is driven another stud N11 at a spaced distance fromthe axisof rotation of the gear. Over the endof the stud 11 extendingfrom the gear 8 `is positioned a liber roller 12, around whichispositioned ro i,

innerfyend of the plunger reciprocally mounted in a bushing 17 clampedbetween f the lower end of the casingA 1 and cover 2.

`It. will be here noted that the pivotal lcon- A nection between theconnecting rod 14 and the plunger 15 is such that the force of thedownward or outward stroke of theconnectingrod is directed against the,whole en d of the plunger and not merely against the small pin 16connecting the same. The strain on the pin 16 when the plunger lmovesinwardly is also negligible since ,the resiliency of the body upon whichthe machine is used and the resiliency of the body contact member 19tends to force the plunger inwardly; therefore, the opposing forces atthe joint, when `the plunger moves inwardly, are substantiallycompression forces instead of tension.

The connecting rod 1li and the plunger 15 are provided at theirconnected ends, respectively at their outer and inner sides, withcircular recesses 14h yand 15a, concentric with the axis ofthe pin 16.AInto these circular recesses extend correspondingly rounded portions atthe ends of the outer and'inner sides of the plunger-15 and theconnecting rod 14, respectively, thus forming large bearing surfaces anda compact and eiiicient, as

rwell as durable, pivotal connection between said members.

The opening 1e at the lower portion of the Ycasing 1,-through which thebushing 17 extends,` isV preferably more than semicircular,` as shownAbest in ligs.k 2 and 4 of the drawings', which structure prevents thebushing 17from falling out sidewise when the cover is removed, andtherefore prevents the plunger,l the connecting rod and other membersfrom Afalling out when the cover is removed;

The inner end of the bushing 17 is acutely beveled so as to catch anysuperfluous oil or grease and retain the samewithin the casing. Theopposite end of the bushing 17 casing 1, as shown in Figs. 3

is provided with a stuffing box` cap 18 to further prevent oil or greasefrom leaving the casing around the plunger. At the outwardly extendedend of the plunger 15 is secured a body contactineniber 19 of anysuitable or Vdesired construction.

The motor of the machine is connected with a source of electrical energyby means ofan electrical cable 2O which extends upwardly through thecylindrical portion. 1b of the casing and outwardly through the hollowhandle member 21, as shown best in Fig. 1. l y

The handle `member 21 is provided at its forward end with a downwardlyextending enlarged portion 21a, at Hthe lower and' forward end of whichare provided oppositely disposed lugs 2lb, which are adapted to extendinto slots 1f at the back side of the and .tof the drawings. To securethe handle member 21 to the casing 1, there are providedY screws 22which extend. from the inner side of the casing- 1 backwardly throughthe wall'thereof into the handle member. l Any suitable means may beemployed for lubricating the bearings ofthe studs and the inotor's'haft,such as the grease plugs 23, shown in Fig. 1. i

It is obvious from this construction', as illustrated in the drawingsand disclosed` in the specification, that there is provided atherapeutic percuvssor as aimed at *and set forthy inl the objects ofthe invention, 4,and though I have shown anddescribed a` particularconstruction, combination` and arrangement of parts and portions, I donot wish to be limited to this particular construction,

lUU

combination and arrangement, but Adesire to I include in the scope of myinvention thev construction, combination and arrangementsubstantially asset forth in the appended claims.

Having thus described myinventi on, what Ifclaim as new and desire tosecur'e'by Letters Patent, is: n n

1. In a machine of the class described, a casing, a cover for saidcasing, a; toothed drive pinion revolubly mounted within said casing, atoothed drive gearl revollibly mounted within vsaid casing andmeshingwith said drive pinion andprovidednwith an outwardly extending bearingstud spaced from the axis ofrotation of said gear, a connecting` rodrevolubly mountedandloosely positioned at its one end overy said bearingstud,'a kremovable stuffing box bushing Aposi-V tioned in' a more thansemicircular opening in said casing and clamped therein byl` said cover,and a plunger Vrod reciprocally mounted in said bushing 'and,pivotallyconnected with the opposite end of said connecting rod.

A2. In a machine ,of the class described', a casing, s cover for saidcasing, a drive pinion revolublyV mounted within said 'f casing', a;`

drive gear revolubly mounted wit-hin saidy casing and meshing withsaid'drive pinion land provided with an outwardly extending mounted andloosely positioned at its oneV end over said bearing stud, a removablestufi'- ing box bushing positioned ina more than semioircular opening insaid casing and clamped therein by said cover, and a plunger rodreciprocally mounted in said bushing and pivotally connected with theopposite end of said connecting rod in such a manner as to prevent theremoval of the connecting rod from the bearing stud of the gear withoutremoving said bushing. Y

3. In a machine of the class described, a casing, a cover foi-saidcasing, a drive pinion revolubly mounted within said casing, a drivegear revolubly mounted within said casing and meshing with said drivepinion and provided with an ,outwardly extending bearing stud spacedfrom the axis of rotation of said gear, a connecting rod revolublymounted and loosely positioned at its one end over said bearing stud, aremovable stuifing box bushing positioned in a more than semicircularopening in said casing` and clamped therein by said cover, and a plungerrod reciprocally mounted in said bushing and pivotally connected withthe opposite end of said connecting rod in such a manner as to preventthe removal of the connecting rod from the bearing stud of the gearWithout removing said bushing, the pivotal connection between saidconnecting rod and said plunger rod beingvsuch that the entire force ofthe downwardv stroke of the connecting rod is directed over the wholecross-sectional area of the inner end of the plunger rod.

4t. In a machine of the class described, a long easing having aremovable cover at its front side and a handle at its upper portion, amotor secured to the lower portion of the back side thereof and havingits shaft extended into said casing, a pinion positioned within saidcasing and secured to said shaft, a gear positionedin the upper portionofv said casing in mesh with said pinion and provided with a backwardlyextending bearingy stud whereby the saine is loosely and readilyremovably mounted in said casing, said gear having at its outer side an`outwardly extending bearing stud positioned eccentrically relative tothe axis of the gear, said gear being retained in position by a bearinglug extending inwardly from said cover and positioned outside of thepath of the eccentric bearing stud of said gear, a connecting rodprovided with a large head loosely mounted over said eccentric stud, abushing clamped between the casing' and. its

cover at theirnormally lower ends, a plungv er recipi'ocall'y mounted insaid bushing, the i inner end of said plunger and the free end of saidconnecting rod being loosely pivotally connected together whereby ftheconnecting rod may be lifted from the plunger when the bushing isremoved, the connecting rod being held inV position by the engagement ofthe free end thereof by the inner end of said plunger.

In testimony whereof, I have hereunto set my hand atSa-n Diego,California, this 22d I day of July, 1924. p

f WILLIAM H. SVEE'ILAND,

